darcys...@gmail.com wrote: > Hi all, > > I am experiencing some odd direction changes on a home-brew CNC > machine that I have on loan. > The machine was apparently purchased off ebay, and all the settings I > dug out from data sheets for the driver chips and motors. > > X and Y are working well, but Z (which has a similarly spec'ed but > different motor from the other two) decides to change direction at > random. > The basic behavior is that when you push the jog button in a certain > direction you don't know which direction it will go. > It will maintain it's course in that direction, but when releasing the > button and pressing it again, it will again choose a random direction. > Thus the problem it is very easy to reproduce. > > I am interested to hear what you think this problem may be caused by? > I have yet to pull out the oscilloscope, but being a relative newcomer > I wanted to ask for advise on how best to debug this problem. > > I should add that I did have this CNC set up briefly on Mach3, and > encountered the same issue. > > Thanks in advance, > > Karl
Seems you have an electrical problem if using different software results in similar behavior. You might have: - a switch contact bounce problem, - relay contact issue, - broken cable(s) for the axis, - bad ground for the Z-axis driver, - poor connections (corrosion or bent pins) in any of the connectors between the motor and electronics, - lose encoder or light leakage, - bad power supply (noise, spikes when a motor starts, - -- Rafael ------------------------------------------------------------------------------ Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
